Thanks, I already wondered how to get the integral out of the
quad_qags output but didn't realize how to get a particular element of
a list. It seems like the problem is some kind of a bug though: The
output is always the same but sometimes the gnuplot window containing
the plot appears while sometimes (in by far most of the cases) it
doesn't. However, on an other machine it appears every time, so it is
working so far now. The plots look a bit strange though:
http://dl.dropbox.com/u/13402100/screenshot_01.png Beginning with the
black line the plots are non-continuous (the violet one is even a
single point) and they have a strange break on the left side. Since I
still don't fully understand what the particular commands do, I've no
clue whether anything can be done to solve these problems... Maybe the
"resolution" (some kind of iteration number during the integration)
can be increased somehow to make the graphs smoother?
Big thanks,
Michael
2011/3/23 Raymond Toy <toy.raymond at gmail.com>:
> On 3/23/11 7:57 AM, michael.kogan at gmx.net wrote:
>> Ray, Robert, thanks for your suggestions!
>>
>> Unfortunaly I'm quite new to Maxima and currently I'm able to use it as
>> a kind of a big calculator and plotter only. I've tried to find out how
>> your code works, but didn't make much progress in this.
>>
>> As I see "quad_qags" is some kind of alternative to "integrate" with
>> different integration mechanisms and a bit different output. But what
>> is the [1] after it?
> quad_qags returns a list, and the first element of the list is the
> estimated value of the integral. ?"? quad_qags" will give you more
> information.
>
> Ray
>
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